[Bug Report] Breaks when used in laravel mix compilation with webpack configuration

[Geowan]

Environment

Browsers: Chrome 75.0.3770.100
OS: Linux x86_64

Steps to reproduce

I have added the vuetify-loader in webpack mix like

 class VuetifyRules {
   webpackRules() {
    return  {
        test: /\.s(c|a)ss$/,
        use: [
            'vue-style-loader',
            'css-loader',
            {
                loader: 'sass-loader',
                options: {
                    implementation: require('sass'),
                    fiber: require('fibers'),
                    indentedSyntax: true // optional
                }
            }
        ]
    }
}
  }  

 const VuetifyLoaderPlugin = require('vuetify-loader/lib/plugin'); 
  mix.extend('vuetify', new VuetifyRules());
  mix.setPublicPath('web/');
  mix.js('app/app.js', 'web/app.js').webpackConfig({
   plugins: [
       new VuetifyLoaderPlugin()
    ],
 });

Expected Behavior

To compile without errors

Actual Behavior

Throws an error when used in the webpack plugins on laravel mix.
the error is :

 UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'length' of undefined
at items.forEach.item (/node_modules/vuetify-loader/lib/loader.js:21:60)
at Set.forEach (<anonymous>)

By removing the plugins on laravel mix am getting the error Module build failed:
@content($material-light)
^
Invalid CSS after " @content": expected "}", was "($material-light); "
which as per the documentation you are supposed to add the vuetify loader plugin

Reproduction Link

[KaelWD]

Duplicate of #49